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  • 1
    Digitale Medien
    Digitale Medien
    Semantic and schematic similarities between database objects: a context-based approach (1996)
    Springer
    The VLDB journal 5 (1996), S. 276-304 
    Details
    ISSN: 0949-877X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract. In a multidatabase system, schematic conflicts between two objects are usually of interest only when the objects have some semantic similarity. We use the concept of semantic proximity, which is essentially an abstraction/mapping between the domains of the two objects associated with the context of comparison. An explicit though partial context representation is proposed and the specificity relationship between contexts is defined. The contexts are organized as a meet semi-lattice and associated operations like the greatest lower bound are defined. The context of comparison and the type of abstractions used to relate the two objects form the basis of a semantic taxonomy. At the semantic level, the intensional description of database objects provided by the context is expressed using description logics. The terms used to construct the contexts are obtained from {\em domain-specific ontologies}. Schema correspondences are used to store mappings from the semantic level to the data level and are associated with the respective contexts. Inferences about database content at the federation level are modeled as changes in the context and the associated schema correspondences. We try to reconcile the dual (schematic and semantic) perspectives by enumerating possible semantic similarities between objects having schema and data conflicts, and modeling schema correspondences as the projection of semantic proximity with respect to (wrt) context.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s007780050029
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  • 2
    Digitale Medien
    Digitale Medien
    Bounding the effects of compensation under relaxed multi-level serializability (1996)
    Springer
    Distributed and parallel databases 4 (1996), S. 355-374 
    Details
    ISSN: 1573-7578
    Schlagwort(e): Multidatabase Transactions ; Compensation ; Relaxed Correctness Criteria ; K-Serializability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract The multi-level transaction concept provides a powerful tool for structuring activities in multidatabase systems. However, even multi-level serializability is sometimes too restrictive as a correctness criterion, either because of very high concurrency requirements, or because of the practical difficulties of implementing a scheduler in actual production environments. The extended multi-level transaction model presented in this paper supports higher concurrency in cases where higher level operations commute in one direction, but not in the other-i.e., when it is valid to interchange them when they occur in one order in a history, but not when they occur in the other order. We introduce a relaxed correctness criterion based on allowing a bounded number of out of order conflicts at each level in the multi-level framework, where the bound can be different for different levels. Finally we discuss the properties of compensation in this framework, developing a theory of compensation which depends only on the semantics of the operations and not on the particular state of the database. We illustrate the use of these concepts in the context of a particular class of practical applications.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00119339
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  • 3
    Digitale Medien
    Digitale Medien
    The Carnot Heterogeneous Database Project: Implemented Applications (1997)
    Springer
    Distributed and parallel databases 5 (1997), S. 207-225 
    Details
    ISSN: 1573-7578
    Schlagwort(e): enterprise integration ; workflow management ; agents interoperation ; heterogeneous databases ; scientific decision support ; data mining
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract The Carnot project was an ambitious research project inheterogeneous databases. It integrated a variety of techniques toaddress a wide range of problems in achieving interoperation inheterogeneous environments. Here we describe some of the majorimplemented applications of this project. These applications concern(a) accessing a legacy scientific database, (b) automating a workflowinvolving legacy systems, (c) cleaning data, and (d) retrievingsemantically appropriate information from structured databases inresponse to text queries. These applications support scientificdecision support, business process management, data integrityenhancement, and analytical decision support, respectively. Theydemonstrate Carnot‘s capabilities for (a) heterogeneous queryprocessing, (b) relaxed transaction and workflow management, (c)knowledge discovery, and (d) heterogeneous resource modelintegration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008645509474
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  • 4
    Digitale Medien
    Digitale Medien
    A partially distributed deadlock detection algorithm (1985)
    Springer
    International journal of parallel programming 14 (1985), S. 307-330 
    Details
    ISSN: 1573-7640
    Schlagwort(e): Deadlock detection ; concurrency control ; distributed database systems ; distributed deadlock detection algorithms ; performance comparison
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract In this paper, a partially distributed deadlock detection algorithm [PDDDA] with multiple outstanding requests is presented for use in distributed database systems. This algorithm allows a process to request many resources simultaneously and uses a central controller for detecting multisite deadlocks. The detection of local deadlocks and the maintenance of local deadlock information are performed at each of the local sites. This partially distributed algorithm alleviates the problem of congestion at the central controller in a centralized algorithm and needs fewer messages and smaller storage space than a fully decentralized algorithm. A set of criteria for comparing deadlock detection algorithms are also given and then used to compare PDDDA with a fully decentralized algorithm proposed by Isloor and Marsland.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00987040
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  • 5
    Digitale Medien
    Digitale Medien
    WebWork: METEOR2's Web-Based Workflow Management System (1998)
    Springer
    Journal of intelligent information systems 10 (1998), S. 185-215 
    Details
    ISSN: 1573-7675
    Schlagwort(e): workflow systems ; web technology ; distributed systems ; database systems
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract METEOR2 workflow management systems consist of both (1) design/build-time and (2) run-time/enactment components for implementing workflow applications. An enactment system provides the command, communication and control for the individual tasks in the workflow. Tasks are the run-time instances of intra- or inter-enterprise applications. We are developing three implementations of the METEOR2 model: WebWork, OrbWork and NeoWork. This paper discusses WebWork, an implementation relying solely on Web technology as the infrastructure for the enactment system. WebWork supports a distributed implementation with participation of multiple Web servers. It also supports automatic code generation of workflow applications from design specifications produced by a comprehensive graphical designer. WebWork has been developed as a complement of its more heavyweight counterparts (OrbWork and NeoWork), with the goal of providing ease of workflow application development, installation, use and maintenance. At the time of this writing, WebWork has been installed by several of the LSDIS Lab's industrial partners for testing, evaluation and building workflow applications.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008660827609
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  • 6
    Digitale Medien
    Digitale Medien
    Managing heterogeneous multi-system tasks to support enterprise-wide operations (1995)
    Springer
    Distributed and parallel databases 3 (1995), S. 155-186 
    Details
    ISSN: 1573-7578
    Schlagwort(e): Workflow ; Automation ; Databases ; Heterogeneity ; Transactions ; Tasks
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract The computing environment in most medium-sized and large enterprises involves old main-frame based (legacy) applications and systems as well as new workstation-based distributed computing systems. The objective of the METEOR project is to support multi-system workflow applications that automate enterprise operations. This paper deals with the modeling and specification of workflows in such applications. Tasks in our heterogeneous environment can be submitted through different types of interfaces on different processing entities. We first present a computational model for workflows that captures the behavior of both transactional and non-transactional tasks of different types. We then develop two languages for specifying a workflow at different levels of abstraction: the Workflow Specification Language (WFSL) is a declarative rule-based language used to express the application-level interactions between multiple tasks, while the Task Specification Language (TSL) focuses on the issues related to individual tasks. These languages are designed to address the important issues of inter-task dependencies, data formatting, data exchange, error handling, and recovery. The paper also presents an architecture for the workflow management system that supports the model and the languages.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01277644
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  • 7
    Digitale Medien
    Digitale Medien
    An overview of workflow management: From process modeling to workflow automation infrastructure (1995)
    Springer
    Distributed and parallel databases 3 (1995), S. 119-153 
    Details
    ISSN: 1573-7578
    Schlagwort(e): Business Process Re-engineering ; Workflow Systems ; Customized Transaction Management
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract Today's business enterprises must deal with global competition, reduce the cost of doing business, and rapidly develop new services and products. To address these requirements enterprises must constantly reconsider and optimize the way they do business and change their information systems and applications to support evolving business processes. Workflow technology facilitates these by providing methodologies and software to support (i) business process modeling to capture business processes as workflow specifications, (ii) business process reengineering to optimize specified processes, and (iii) workflow automation to generate workflow implementations from workflow specifications. This paper provides a high-level overview of the current workflow management methodologies and software products. In addition, we discuss the infrastructure technologies that can address the limitations of current commercial workflow technology and extend the scope and mission of workflow management systems to support increased workflow automation in complex real-world environments involving heterogeneous, autonomous, and distributed information systems. In particular, we discuss how distributed object management and customized transaction management can support further advances in the commercial state of the art in this area.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01277643
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  • 8
    Digitale Medien
    Digitale Medien
    OBSERVER: An Approach for Query Processing in Global Information Systems Based on Interoperation Across Pre-Existing Ontologies (2000)
    Springer
    Distributed and parallel databases 8 (2000), S. 223-271 
    Details
    ISSN: 1573-7578
    Schlagwort(e): query processing in global information systems ; distributed heterogeneous data access ; domain ontologies
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract There has been an explosion in the types, availability and volume of data accessible in an information system, thanks to the World Wide Web (the Web) and related inter-networking technologies. In this environment, there is a critical need to replace or complement earlier database integration approaches and current browsing and keyword-based techniques with concept-based approaches. Ontologies are increasingly becoming accepted as an important part of any concept or semantics based solution, and there is increasing realization that any viable solution will need to support multiple ontologies that may be independently developed and managed. In particular, we consider the use of concepts from pre-existing real world domain ontologies for describing the content of the underlying data repositories. The most challenging issue in this approach is that of vocabulary sharing, which involves dealing with the use of different terms or concepts to describe similar information. In this paper, we describe the architecture, design and implementation of the OBSERVER system. Brokering across the domain ontologies is enabled by representing and utilizing interontology relationships such as (but not limited to) synonyms, hyponyms and hypernyms across terms in different ontologies. User queries are rewritten by using these relationships to obtain translations across ontologies. Well established metrics like precision and recall based on the extensions underlying the concepts are used to estimate the loss of information, if any.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008741824956
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  • 9
    Digitale Medien
    Digitale Medien
    Exception Handling in Workflow Systems (2000)
    Springer
    Applied intelligence 13 (2000), S. 125-147 
    Details
    ISSN: 1573-7497
    Schlagwort(e): case-based reasoning (CBR) ; context-dependent reasoning ; exception handling ; ontology ; workflow system
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract In this paper, defeasible workflow is proposed as a framework to support exception handling for workflow management. By using the “justified” ECA rules to capture more contexts in workflow modeling, defeasible workflow uses context dependent reasoning to enhance the exception handling capability of workflow management systems. In particular, this limits possible alternative exception handler candidates in dealing with exceptional situations. Furthermore, a case-based reasoning (CBR) mechanism with integrated human involvement is used to improve the exception handling capabilities. This involves collecting cases to capture experiences in handling exceptions, retrieving similar prior exception handling cases, and reusing the exception handling experiences captured in those cases in new situations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008388412284
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  • 10
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    Smart cities – enabling services and applications (2016)
    Springer
    Details
    Publikationsdatum: 2016-06-21
    Print ISSN: 1867-4828
    Digitale ISSN: 1869-0238
    Thema: Informatik
    Publiziert von Springer
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